Perhaps you should try some spelling variations:
thong than » thong thanh, thong phan, thong nhan
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
cua thong » cua thuong, cua khong, cua tong
thong tan » thong tran, thong tin, thong van
anh mang » hanh mang, anh bang, anh dang
mang cua » manh cua, dung cua, ban cua
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - anh mang cua thong ((thong tan) OR (thong than)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - anh mang cua thong ((thong tan) OR (thong than)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - anh mang cua thong ((thong tan) OR (thong than)) toan cau*.